chore(main): release 0.0.0-alpha.61

[energy-models-release-please]

🤖 I have created a release beep boop

0.0.0-alpha.61 (2026-09-01)

Features

• a model is checked from the shell, advice included, with no consumer installed (#192) (941126c)
• a named expression may give a value per region, and no two regions may claim one coordinate (#168) (e12e7da)
• a piecewise method answers which curvature it is exact for (#135) (6f0fff1)
• a program is the second public state, and one call reaches it (#177) (c9ee1ab)
• a snapshot is a timestamp, in the file and in every rung's network (#159) (dd5122e)
• advice carries which pass said it and which declaration it is about, so a consumer can filter rather than parse (#195) (89408f6)
• examples: a link delivers to as many buses as its data declares, not two (#273) (0ece0d8)
• language: dimension members and lookup maps come from the data, rather than from the file (#169) (f3c4e5f)
• language: which dims a mask reads is the language's answer, so two consumers cannot restrict one model differently (#269) (350b1ed)
• parser: a refused expression names the rewrite rather than only the grammar's complaint (#332) (02121b8)
• pin the eight names that keep this package and its consumer in step (#51) (15a354b)
• position(dim) replaces index(dim, i), converting on the left (#31) (8f78ac5)
• program: a parameter says which piecewise block derived it, and a label space keeps its dtype (#227) (515dbd5)
• program: a piecewise assumption names the data it is about, and a derived parameter says how it is filled (#237) (48431b1)
• program: a piecewise block is kept as facts — its breakpoints, its mask, and what it assumes of the data (#228) (2fdbd6f)
• program: a program says which of the language's constructs it uses (#207) (4e55a15)
• program: a resolved where is a first-class Mask whose leaves carry their dims, and the where grammar is package-private (#327) (53cc352)
• program: the conjuncts of a where mask are the program's to give, not each consumer's to re-derive (#313) (db63d3c)
• PyPSA in one file — every rung stated, shown beside its data, and solved to the same objective on both lanes (#122) (46544e3)
• rung 11 — PyPSA's ac-dc-meshed example, whole (#151) (a133044)
• rung 12 — linearized unit commitment, a file of its own (#152) (69b926e)
• rung 13 — transmission losses in tangent form, a file of its own (#153) (379ce23)
• rung 14 — two-stage stochastic with CVaR, a file of its own (#154) (41b427d)
• rung 15 — investment periods with a growth limit, a file of its own (#155) (285aac3)
• the notes a check prints are reachable, so a consumer surfaces them rather than re-deriving them (#184) (19ef814)
• upright is what the model is given, italic is what the solver chooses (#44) (cbccc68)

Bug Fixes

• a file the language accepts is one every consumer can build, the edge rules being decided at load (#211) (a362ff0)
• advice: a model handed over as a program is advised of everything a file is (#217) (4fc50e6), closes #210
• docs: the homepage feature cards render as cards rather than as loose rules and paragraphs (#145) (b88e5dc)
• enforce the two rules a named offset or width was always said to obey (#61) (5bd92dc), closes #58
• examples: a committable modular unit that is not extendable gets the rows PyPSA builds for it (#271) (5af0ac8)
• language: a boolean literal in a where is decided at load wherever it stands (#216) (fab308f), closes #214
• language: a link takes any affine expression, an uncalled template hides no typo, and degree is decided at load (#91) (a653056)
• language: a negative edge fill prints, the sign of a literal amount being folded once at resolution (#234) (d9303db)
• language: a negative sum_back width is refused at load rather than asserting in lowering (#223) (62e52eb), closes #222
• language: a where mask is folded at resolution, so a typeset page and a program agree about it (#232) (553bda0)
• language: the language reference states which case arms are refused, and the refusal says what actually breaks (#336) (01920d1)
• let sum_back stop at each group's edge, as its checks already assumed (#65) (cb58e88)
• parser: a negation is over a power, a keyword is given once, and an amount is a number or a name (#88) (4bf994c)
• parser: a parsed expression cannot be rewritten under another pass (#329) (fcfb7b8)
• program: a program describes a mathematical program rather than being one, and claims neither linearity nor a storage format (#315) (5dfa6be)
• program: a where mask cannot be rewritten under another consumer (#197) (ce406b0)
• program: an unknown dimension is refused rather than answered empty (#199) (96fdccf)
• program: every expression node answers fan_in (#202) (f5cc67d)
• refuse a negated named amount, and one read where there is no coordinate (#63) (15d9c25), closes #62
• refuse a str or bool parameter where arithmetic wants a number (#71) (9b320fd)
• schema: every refusal of a malformed file is a SchemaError, and an empty declared map survives a round trip (#89) (ee07736)
• schema: two literal bounds that cross are refused at load (#97) (30589ba)
• stop prettier rewriting what release-please generates (#27) (7486555)
• stop the release build silently shipping a 0.0.0 wheel (#23) (a801b00)
• the ac-dc-meshed rung states its network, so the reference run needs no download (#166) (abf734c)
• the linearized rung states its three caps as rows and starts one unit cold, so every block it declares is built (#162) (cb4863f)
• the notation page is generated again, and something says so (#41) (3dad75e)
• the release notes landed inside an HTML comment (#25) (c33dc24)
• to_markdown printed TeX's em-dash ligature, not an em dash (#34) (226407a)
• typeset: a string value in a where clause prints as a quoted label (#114) (9be22c1)
• typeset: a sum under its own dimension takes a fresh index, and prose escapes its markup (#92) (20c7076)

Performance

• program: a mask walks its leaves once and every question reads that walk (#338) (337d169)

Refactoring

• a program is trusted by construction, so the language's rules are checked once, on the spec (#189) (45931b1)
• dead branches, an unused depth cap and prose about a parent project are gone (#86) (f31f3b0)
• extract the language and typeset from lpspec (#17) (b997193)
• name the groups a pass asks about, and spell each operator once (#52) (e35c46c)
• one call returns every note the language can give without data (#191) (2face7a)
• parser: one number rule, one amount table, and a namespace nothing builds by hand (#106) (f775a07)
• program: a program is built by keyword, so a new field cannot reorder an old call (#203) (214394a)
• program: a program's declarations are keyed by the name the file wrote (#205) (579264a)
• program: drop the two pieces of the program API nothing reaches (#204) (ca25fa5)
• program: expressions are the ones a row is built from, and the declared ones say so (#206) (81aaddd)
• program: the declaration vocabularies have one home, so a program cannot spell one differently from the file (#219) (f7596d7), closes #209
• program: the program module says what it promises, rather than offering its whole namespace (#208) (08d2f64)
• schema: one wording for an undeclared dimension, and the front door validates once (#105) (69e42db)
• the package is typesetting, the function stays typeset (#54) (a1d9599)
• the stack's own additions say less and repeat nothing (#102) (119e588)
• the tree describes this package, not the project it was cut from (#94) (9673f9a)
• two public states and a conversion to each, where the surface was seventy-seven names (#180) (718e2de)
• typeset: Markdown is LaTeX's math with its own document layer, and a step merges itself (#107) (1ca9178)

Documentation

• a link's delivery lags its flow, wrapping or losing what is in transit at the horizon's edge (#300) (1d4f10f)
• a named offset needs no edge=, the limitation it named is gone (#68) (d91a0c3), closes #64
• AGENTS.md says what a change here is held to (#76) (5e142f5)
• agents: the cheap gates run here, and CI is reported rather than watched (#175) (78e3d80)
• an Examples section, each model beside the math it prints (#38) (66bfae4)
• ceiling: load-time unit checking has its own refusal, where the data-prep row used to answer for it (#272) (8dfd17d)
• drop the effects row from the PyPSA-1.3.0 parity table, a feature that release does not have (#305) (92e5ed8)
• examples: the PyPSA file states a constraint once where PyPSA builds one row set, rather than a block per regime (#257) (#292) (c35e637)
• language: a label space may group a position, though not a reduction or a walk (#281) (00be0cb)
• language: the absence page is half the length and shows each rule on a model (#127) (147788a)
• the absence rules cover every operator, not the three they named (#173) (3266a5b)
• the language knows nothing about sinks (#118) (886a854)
• the README's example of reading a loaded model runs as written (#240) (304a233)
• the style guide's front-door example is the function it quotes (#187) (5dbed70)
• the title rules are written for the changelog reader (#79) (fdb52e4)

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This PR was generated with Release Please. See documentation.

[energy-models-release-please]

🤖 Created releases:

• v0.0.0-alpha.61

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